Loading

  • 21 Aug, 2019

  • By, Wikipedia

W Hydrae
W Hydrae is a Mira-type variable star in the constellation Hydra. The star is nearly located within the Solar neighborhood, at 320 light years from the Solar System. It has a visual apparent magnitude range of 5.6 to 10. In the near-infrared J band it has a magnitude of -1.7, is the 7th brightest star in the night sky, and is even brighter than Sirius.

Water and dust masers

The star also shows signs of intense water emissions, indicative of the presence of a wide disk of dust and water vapour. Such emissions cover a zone spanning between 10.7 Astronomical Units (within Saturn's orbital zone) and 1.2 parsecs (or nearly 247,500 Astronomical Units, as far away as the Oort Cloud in Solar System).

Notes

  1. ^ Radius calculated using a distance of 98+30
    −18     parsecs     and an angular diameter of 41.4 milliarcseconds (0.041 arcsec). 98 • 0.041 = diameter of 4.06 AU, which is multiplied by 107.5 to convert from AU to R☉.

References

  1. ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. ^ "GCVS Query=W Hya". General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2012-08-22.
  3. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  4. ^ "V* W Hya". SIMBAD Astronomical Database. Retrieved 2012-08-21.
  5. ^ Vlemmings, W. H. T.; Van Langevelde, H. J.; Diamond, P. J.; Habing, H. J.; Schilizzi, R. T. (2003). "VLBI astrometry of circumstellar OH masers: Proper motions and parallaxes of four AGB stars". Astronomy & Astrophysics. 407: 213–224. arXiv:astro-ph/0305405. Bibcode:2003A&A...407..213V. doi:10.1051/0004-6361:20030766. S2CID 11505142.
  6. ^ Takeuti, Mine; Nakagawa, Akiharu; Kurayama, Tomoharu; Honma, Mareki (2013). "A Method to Estimate the Masses of Asymptotic Giant Branch Variable Stars". Publications of the Astronomical Society of Japan. 65 (3): 60. Bibcode:2013PASJ...65...60T. doi:10.1093/pasj/65.3.60.
  7. ^ Ohnaka, K.; Wong, K. T.; Weigelt, G.; Hofmann, K.-H. (November 2024). "Contemporaneous high-angular-resolution imaging of the AGB star W Hya in vibrationally excited H 2 O lines and visible polarized light with ALMA and VLT/SPHERE-ZIMPOL". Astronomy & Astrophysics. 691: L14. arXiv:2411.09759. doi:10.1051/0004-6361/202451977. ISSN 0004-6361.
  8. ^ Zubko & Elitzur, Moshe (2000). "Water and Dust Emission from W Hydrae". The Astrophysical Journal. 544 (2): 137–140. arXiv:astro-ph/0009440. Bibcode:2000ApJ...544L.137Z. doi:10.1086/317317. S2CID 17702515.



Stub icon

This variable star–related article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=W_Hydrae&oldid=1272089541"